<template>
  <div>
    <el-breadcrumb separator-class='el-icon-arrow-right'>
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-alert
        title='添加商品信息'
        type='info'
        center
        show-icon>
      </el-alert>

      <el-steps :space='200' :active='activeIndex-0' finish-status='success' align-center>
        <el-step title='基本信息'></el-step>
        <el-step title='商品参数'></el-step>
        <el-step title='商品属性'></el-step>
        <el-step title='商品图片'></el-step>
        <el-step title='商品内容'></el-step>
        <el-step title='完成'></el-step>
      </el-steps>

      <el-form :model='addForm' :rules='addFormRules' ref='addFormRef' label-position='top' label-width='100px'>
      <el-tabs v-model='activeIndex' tab-position='left' :before-leave='beforeTabLeave' @tab-click='tabClicked'>
        <el-tab-pane label='基本信息' name='0'>
            <el-form-item label='商品名称' prop='goods_name'>
              <el-input v-model='addForm.goods_name'></el-input>
            </el-form-item>
            <el-form-item label='商品价格' prop='goods_price'>
              <el-input v-model='addForm.goods_price' type='number'></el-input>
            </el-form-item>
            <el-form-item label='商品重量' prop='goods_weight'>
              <el-input v-model='addForm.goods_weight' type='number'></el-input>
            </el-form-item>
            <el-form-item label='商品数量' prop='goods_number'>
              <el-input v-model='addForm.goods_number' type='number'></el-input>
            </el-form-item>
            <!-- 级联选择器 -->
            <el-form-item label='商品分类' prop='goods_cat'>
              <el-cascader v-model='addForm.goods_cat' :options='cateList'
                           :props="{ expandTrigger: 'hover', ...cateProps }" @change='handleChange'></el-cascader>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label='商品参数' name='1'>
            <el-form-item :label='item.attr_name' v-for='item in manyTableData' :key='item.attr_id'>
              <el-checkbox-group v-model='item.attr_vals'>
                <el-checkbox border :label='item' v-for='(item, i) in item.attr_vals' :key='i'>{{ item }}</el-checkbox>
              </el-checkbox-group>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label='商品属性' name='2'>
            <el-form-item :label='item.attr_name' v-for='item in onlyTableData' :key='item.attr_id'>
              <el-input v-model='item.attr_vals'></el-input>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label='商品图片' name='3'>
          <!--
            action 表示图片要上传到的后台API地址
            handlePreview 点击预览触发
            handleRemove 删除图片触发
            fileList 指定文件列表
            list-type 指定预览组件的呈现方式
           -->
          <el-upload
            :action='uploadURL'
            :on-preview='handlePreview'
            :on-remove='handleRemove'
            list-type='picture'
            :headers='headersObj'
            :on-success='handleSuccess'>
            <el-button size='small' type='primary'>点击上传</el-button>
            <div slot='tip' class='el-upload__tip'>只能上传jpg/png文件，且不超过500kb</div>
          </el-upload>
        </el-tab-pane>
        <el-tab-pane label='商品内容' name='4'>
          <!-- 富文本编辑器组件 Two-way Data-Binding -->
          <quill-editor ref='myQuillEditor' v-model='addForm.goods_introduce' />
          <!--            添加按钮-->
          <el-button type='primary' class='AddBtn' @click='addShop'>添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
      </el-form>
    </el-card>

    <!--    图片预览-->
    <el-dialog title='图片预览' :visible.sync='previewDialogVisible' width='50%'>
      <img :src='previewPath' alt='' class='perviewImg' />
    </el-dialog>
  </div>
</template>

<script>
import { goodsAddFormRulesMixin } from '@/common/mixin.js'
import _ from 'lodash'

export default {
  mixins: [goodsAddFormRulesMixin],
  data() {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 存放商品列表数据
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态参数列表数据
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片的路径
      previewPath: '',
      // 图片预览的对话框
      previewDialogVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表失败!')
      }
      this.cateList = res.data
    },

    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
      console.log(this.addForm.goods_cat)
    },

    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName == '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },

    async tabClicked() {
      if (this.activeIndex === '1') {
        console.log('动态参数')
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态列表失败!')
        }
        res.data.forEach(item => (item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')))
        console.log(res)
        this.manyTableData = res.data
      }

      if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态列表失败!')
        }
        this.onlyTableData = res.data
        console.log(this.onlyTableData)
      }
    },

    // 点击图片预览时触发
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewDialogVisible = true
      // console.log('预览图片', file)
    },

    // 处理移除图片的操作
    handleRemove(file) {
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 从 pics 数组中找到这个图片的对应的索引值
      const index = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3. 调用数组的splice方法,把图片信息对象,从pics数组中移除
      this.addForm.pics.splice(index, 1)
      // console.log('移除图片', file, this.addForm)
    },

    handleSuccess(response) {
      const picInfo = { pic: response.data.tmp_path }
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm)
    },

    addShop() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑
        const form = _.cloneDeep(this.addForm) //_是lodash的方法所产生的命令，目的就是深拷贝
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态参数
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form)
        // 发起请求添加商品数据
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败!')
        }
        this.$message.success('添加商品成功!')
        this.$router.push('/goods')
        // 不能直接做转换因为在 级联选择器 中双向绑定了 goods_cat 作为key
        // this.addForm.goods_cat = this.addForm.goods_cat.join(',')
      })
    }
  },

  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped>
.el-steps {
  margin: 15px 0;
}

.el-step__title {
  font-size: 13px;
}

.el-checkbox {
  margin: 0 5px 0 0 !important;
}

.perviewImg {
  width: 100%;
}

.AddBtn {
  margin-top: 15px;
}
</style>
